{"product_id":"spi-34-373-1-double-end-plug-thread-gage-12-28-2b","title":"Spi 34-373-1 Double End Plug Thread Gage 12-28 2B","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 34-373-1 is a double-end plug thread gage used to verify internal thread conformance on machined or tapped holes. One end checks the Go condition to confirm the thread accepts a mating fastener; the opposite end checks the No-Go condition to confirm the thread does not exceed maximum material limits. Built from steel and traceable to NIST standards, this gage is suited for quality control and inspection on the shop floor or in the field. A handle is included. The gage weighs 1 pound and is ready to use out of the package.\u003c\/p\u003e\u003cp\u003eThis gage is intended for inspecting 12-28 unified national threads to a 2B tolerance class. The 2B classification covers standard commercial and industrial internal threads where a controlled fit is required. It is commonly used by machinists, quality inspectors, and maintenance technicians working with precision-threaded components in manufacturing, mechanical assembly, and equipment repair applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDouble-end design with Go and No-Go members on a single tool for efficient thread inspection\u003c\/li\u003e\n\u003cli\u003eThread size 12-28 for inspecting fine-pitch unified national threads\u003c\/li\u003e\n\u003cli\u003e2B tolerance class for standard commercial internal thread verification\u003c\/li\u003e\n\u003cli\u003eSteel construction for durability in production and inspection environments\u003c\/li\u003e\n\u003cli\u003eNIST-traceable calibration included for documentation and compliance requirements\u003c\/li\u003e\n\u003cli\u003eHandle included — no separate purchase required\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for inspecting 12-28 internal threads to the 2B tolerance class per unified national thread standards.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThread gages are inspection tools used by machinists and quality technicians — no power tools or fastener torque is required. Clean the threaded hole and the gage members before use to prevent debris from affecting readings. The Go member should pass through the full thread length under hand pressure only; never force it. Store the gage in its case when not in use to protect the thread form and maintain calibration integrity.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 12-28\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance Class\u003c\/strong\u003e: 2B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGage Type\u003c\/strong\u003e: Double End Plug, Go \/ No-Go\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandle Included\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraceability Standard\u003c\/strong\u003e: NIST\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 41111619\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 34-373-1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51689852141874,"sku":"34-373-1","price":185.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/25ee4fa8d4f9223ae178665f2ab72c61.jpg?v=1788264731","url":"https:\/\/voomisupply.com\/products\/spi-34-373-1-double-end-plug-thread-gage-12-28-2b","provider":"Voomi Supply","version":"1.0","type":"link"}